Restructuring and Related Charges (Details) $ in Thousands			3 Months Ended	6 Months Ended
	Oct. 30, 2018 USD ($)	Oct. 29, 2018	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of reportable segments	2	3	2	2
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of the period				$ 710	$ 3,542
Restructuring charges				8,157	6,284
Restructuring charges related to other initiatives				1,111	6,284
Write off charge and other non‑cash activity				(449)	(308)
Cash payments				(5,997)	(9,095)
Other adjustments				(72)	28
Restructuring reserve, end of the period			$ 2,349	2,349	451
Cost of Product Sales and Services
Restructuring Reserve [Roll Forward]
Restructuring charges				3,316	1,936
General and Administrative Expense
Restructuring Reserve [Roll Forward]
Restructuring charges				4,083	3,113
Sales and Marketing Expense
Restructuring Reserve [Roll Forward]
Restructuring charges				648	733
Research and Development Expense
Restructuring Reserve [Roll Forward]
Restructuring charges				110	502
Two-segment realignment
Restructuring Reserve [Roll Forward]
Restructuring charges				$ 7,046	$ 0
Two-segment realignment | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 22,000
Two-segment realignment | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	17,000
Other Restructuring [Member] | Two-segment realignment | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	7,000
Other Restructuring [Member] | Two-segment realignment | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 6,000